加热温度和冷却工艺对重轨硬度及组织的影响

Effects of Heating Temperature and Cooling Process on Hardness and Microstructure of Heavy Rail

进行了6组对比试验,探究了加热温度和冷却工艺对U71Mn重轨轨头硬度及其组织的影响。结果表明:在820、880、940℃加热温度下,U71Mn重轨轨头经三向喷雾冷却后的硬度值先增加后减小;在相同加热温度(880℃)下,经三向喷雾冷却后的重轨轨头硬度值最大,单向喷雾冷却硬度值次之,而在室温下自然冷却的重轨硬度值最小。

Six groups of comparative experiments were carried out. The effects of heating temperature and cooling process on hardness and microstmcture of U71Mn heavy rail were explored. The results show that： the hardness value of U71Mn heavy rail at the heating temperature of 820, 880 and 940℃ after three directions spray cooling increases firstly and then decreases. Under the same heating temperature （880℃）, the hardness value of the heavy rail after three directions spray cooling is maximum. The hardness value of one-way spray cooling is secondary and hardness value of heavy rail at room temperature under natural cooling is minimum.